<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>

<body>
<script src="../js/vue.js"></script>
<div id="app" v-once>{{message}}</div>


<script>
    const app = new Vue({
        el:'#app',
        data:{
            message:"第一次，系统的学VUE"
        }
    })
</script>

</body>
</html>